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Kaspersky was my AV for several years it never let me down it is amongst the best, but then again I try not to go places that can cause me issues. I now have been running MSI since beta again with no issues. Your surfing habits are what should rule the quality of your AV.

Windows 8 integrates Windows Defender on Windows 8, a more robust version of Windows Defender (and uses that name) for its anti-virus and anti-malware protection. Although it uses the same name, it is not the same as Defender in previous operating systems. Windows 8 Defender provides the same level of protection against malware as Microsoft Security Essentials (MSE) and uses the same virus definition updates.

Since Windows 8 Defender includes anti-virus protection, it may be disabled by the installation of a third-party anti-virus program. If a trial anti-virus came preinstalled on your computer, it most likely turned Windows 8 Defender off (disabled) to avoid conflicts. Windows 8 Defender will remain disabled until the third party anti-virus has been completely uninstalled and then Windows 8 Defender needs to be activated if you choose to use it.

Since you are already using a free version of Kaspersky for one year, I would recommend to continue with it and see how it performs. Kasperky has a very good reputation. When approaching it's expiration, if you are not satisfied...that is the time to consider removing it and enabling Windows 8 Defender.

Check the MS site for compatibility, you will need to do a clan install no upgrade path. I just setup an old Dell after fooling around finding drivers it is doing very well, I did turn off Aero which seemed to speed things up a bit.

And a word of advice if you are able to upgrade the ram I would, I have done over a dozen clean installs over the course of the last couple of months or so for customers with XP to 7 and the first thing I tell them is to upgrade the RAM it will help with the transition.